Planting rice at monsoon onset could mitigate the impact of temperature stress on rice–wheat systems of Bihar, India

Carlo Montes Anton Urfels Eunjin Han Balwinder-Singh (2023, [Artículo])

Rainy Season TIMESAT APSIM Agricultural Production Systems Simulator Climate Adaptation CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA RICE WHEAT MONSOONS WET SEASON CROP MODELLING CLIMATE CHANGE ADAPTATION

Shopping centers at zmcm. The companies, location and production of a neoliberal urban space

Dante-Guillermo Celis-Galindo (2021, [Artículo, Artículo])

This work aims to analyze different aspects of shopping center at the Metropolitan Zone of Mexico City as location, opening year and developer company. Also it will identify diverse characteristics, economic and political phases in the country as well as the role of the development companies and shopping centers as a producers of a neoliberal urban space. This paper presents the way shopping centers importance has growth and how it had become in a neoliberal city characteristic; with this the characteristics of these urban works are visualized and related with their construction companies and local governments which has caused the transformation of the city. After conducting a census, with more than two hundred shopping centers, the study was delimited to those with the greatest significance by size, location and developer. At the beginning of the paper, the characteristics that shopping malls should have for the realization of this work are mentioned. In a first section an approach is made to the theoretical elements of the city and the shopping center and therefore identifying the developers that most  nfluence this process; the second section addresses the characteristics of places by location and the characteristics that urban planners have depending on the area where they are; the third section discusses the years of opening, the squares and relates to government administrations and the economic characteristics of the country; and finally, a tour of the urban regulations in Mexico City and its latest modifications is made.

shopping center neoliberalism space urban space construction company centro comercial neoliberalismo espacio espacio urbano empresa constructora HUMANIDADES Y CIENCIAS DE LA CONDUCTA HUMANIDADES Y CIENCIAS DE LA CONDUCTA

Geospatial analysis of the distribution of empty spaces located in Nuevo Laredo, Tamaulipas

Claudio Curzio HECTOR DE LA TORRE GUTIERREZ (2021, [Artículo, Artículo])

Reflect about urban empty spaces means looking around all these lots that are distributed in different geographical points of the cities and are characterized because they are still waiting to be built, therefore, they are vacant, and also these spaces are empty in the sense of not provide any function. In this sense, the objective of this article is to present a methodological proposal specially designed to study this type of urban elements from the particular point of view of urban geography and spatial analysis. Specifically, through a series of surveys, both digital and physical, the various urban voids located in the city of Nuevo Laredo were recorded, thereby creating a database that included a total of 3,836 case studies. In this way, using different types of statistical techniques and spatial models, it was possible to obtain and interpret the results, managing to identify exactly what were the main patterns and characteristics of said geographic distribution.

empty spaces urban vacant lots geo-spatial analysis urban geography border in Nuevo Laredo Vacíos urbanos lotes baldíos análisis geo-espacial geografía urbana frontera en Nuevo Laredo Geografía urbana economía urbana morfología urbana CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA

Análisis de velocidad de soldadura robotizada para proceso MIG en acero1045 AISI

Carlos Eduardo Hernández Acero (2022, [Tesis de maestría])

Esta investigación denominada “análisis de velocidad de soldadura robotizada para proceso MIG en acero 1045 AISI” busca el desarrollo de un modelo matemático que permita, mediante parámetros conocidos, el cálculo de la penetración de soldadura en piezas unidas con proceso Metal Inert Gas (MIG). El objetivo se centra en buscar la combinación de valores paramétricos para la velocidad de soldadura, el voltaje y la corriente, los que se obtienen mediante la aplicación de un diseño experimental, que, ejecutadas en el proceso, pueda lograr una penetración de soldadura aceptable para la unión de la pieza. El modelo de superficie de respuesta aplicado fue un diseño de experimentos 2k con diseño central compuesto, y posteriormente el modelo se utilizó para estimar la velocidad de soldadura. Este diseño de experimentos se ejecutó por medio del programa estadístico Minitab versión 17. (Hernández Acero et al., 2022). Una vez teniendo la penetración de soldadura deseada en la pieza, se puede calcular la velocidad de soldadura necesaria para el cálculo de tiempo ciclo y utilizar los parámetros definidos de corriente y voltaje. Los valores de estos factores serán útiles para comenzar la programación del robot ya con la celda funcional y reducir el tiempo de arranque en automático (Hernández Acero et al., 2022).

This research, named “robotic welding speed analysis for MIG process in 1045 AISI steel”, seeks to develop a mathematical model that allow, through know parameters, the calculation of welding penetration in parts joined with Metal Inert Gas (MIG) process. The objective is focused on finding the combination of parametric values for robot welding speed, voltage and current, which are obtained through the application of a design of experiments, which, executed in the process, can achieve an acceptable welding penetration for the union of the part. The response surface model applied was a 2k design of experiments with central composite design, and subsequently the model was used to estimate the welding speed. This design of experiments was obtained using the statistical software Minitab version 17. (Hernández Acero et al., 2022). Once having the desired welding penetration in the part, it can calculate the welding speed necessary for the cycle time calculation and use the defined parameters of current and voltage to start programming the robot with the functional cell and reduce the time of startup (Hernández Acero et al., 2022).

Soldadura MIG Penetración Tiempo ciclo Velocidad de soldadura MIG welding Penetration Cycle time Welding speed INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS OTRAS ESPECIALIDADES TECNOLÓGICAS OTRAS OTRAS

The past, the present, the future, and occupational self-efficacy: an attributions and cultural differences perspective

Daniel Arturo Cernas Ortiz (2023, [Artículo, Artículo])

This study´s objective was to examine empirical relationships between three dimensions of time perspective (future, present fatalistic, and past negative) and occupational self-efficacy. By surveying Mexican (n = 286) and U.S. (n = 272) respondents, we also tested the moderating role of culture. Regression analyses revealed that time perspective dimensions have significant associations with occupational self-efficacy, being future time perspective more potent than its past negative and present fatalistic counterparts. Moderation analyses indicated that none of the examined time perspective-self-efficacy relationships varied significantly between the U.S. and Mexico. Overall, this study suggests that relationships between time perspective and occupational self-efficacy vary according to different temporal dimensions, that future TP is key to develop occupational self-efficacy, and that cultural values may not exert a significant influence on the time perspective-occupational self-efficacy connection.

Perspectiva de tiempo autoeficacia diferencias culturales análisis de moderación CIENCIAS SOCIALES CIENCIAS SOCIALES Time perspective self-efficacy cultural differences moderation analysis

Remedies for the Inconsistences in the Times of Execution of the Unsorted Database Search Algorithm within the Wave Approach

Manuel Ávila Aoki José Benito Elizalde Salas (2017, [Artículo])

The typical semiclassical wave version of the unsorted database search algorithm based on a system of coupled simple harmonic oscillators does not consider an important ingredient of Grovers original algorithm as it is quantum entanglement. The role of entanglement in the wave version of the unsorted database search algorithm is explored and contradictions with the time of execution of Grovers algorithm are found. We remedy the contradictions by employing two arguments, one of them qualitative and the other quantitative. For the qualitative argument we employ the probabilistic nature of a legitimate quantum algorithm and remedy the above inconsistence. Within the quantitative argument we identify a parameter in the wave version of the unsorted database search algorithm which is related to entanglement. The contradiction with the time of execution of Grovers algorithm is solved by choosing an appropriate values of such a parameter which incorporates entanglement to the wave version of the unsorted database search algorithm. The utility of the present arguments are evident if the wave version of the unsorted data base search algorithm is experimentally implemented through a system of N quantum dots with a harmonic oscillator potential as a confinement potential for each of the quantum dots. Each of the above N vibrating quantum dots must be coupled to an extra single vibrating quantum dot which entangles to all of them. In order to obtain optimal results, the coupling constants of the mentioned quantum dots should be adjusted in the way described in the present work.

Computación Unsorted database search Grover algorithm wave entanglement queries time Computación Unsorted database search Grover algorithm wave entanglement queries time INGENIERÍA Y TECNOLOGÍA

Socio-spatial segregation of socio-environmental assets of public green spaces in the city of Durango, Mexico

Carlos Alejandro Custodio González Tania Ortiz Patricia Catalina Medina Pérez (2024, [Artículo, Artículo])

The current development model's accumulation logic has resulted in the emergence and consolidation of social processes like segregation, leading to differentiated access and availability of urban goods and services among social groups based on socioeconomic, ethnic, or societal standing. The current development model's accumulation logic has resulted in the emergence and consolidation of social processes like segregation, leading to differentiated access and availability of urban goods and services among social groups based on socioeconomic, ethnic, or societal standing. This disparity impacts employment levels, educational performance, urban decay, and environmental degradation. In this context, the article aims to examine the socio-spatial segregation in the access to socio-environmental amenities provided by public green spaces (EVP) in a medium-sized city, specifically Durango, Mexico. The analysis utilizes spatial analysis and statistical methods that involve five variables associated with EVPs: surface area, percentage, number, density, and the socioeconomic level of the population. A spatial pattern of segregation was identified through these variables, resulting in four clusters that impact how the city of Durango is inhabited, produced, reproduced, lived, and constructed.

sociospatial exclusion public space spatial autocorrelation spatial patterns spatial justice exclusión socioespacial espacio público autocorrelación espacial patrones espaciales justicia espacial CIENCIAS SOCIALES CIENCIAS SOCIALES

The listening in the contemporary city. Theoretical approaches

Gustavo Alfonso Galván Cázares José Guadalupe Rivera González (2021, [Artículo, Artículo])

The present article sets out different theoretical approaches around the sound and the act of listening in the contemporary city as well as the processes of production and significance of the city through the mentioned act. The central goal of this writing is to contribute to the interdisciplinary discussions about the coupling of sound/ listening in the field of urban studies since the aforementioned dissertations are still scarce in the Latin American context. To this effect, firstly, listening as an epistemic means by which the city is learned is discussed. Afterwards, some implications about different global processes in the urbanites’ aural practices are analyzed. Lastly, the necessity of appealing to citizen’s listening as an essential element to consider throughout the planning, construction, remodeling and the plans of territorial restructuring as well as in every physical and symbolic transformation of the city is presented. In this context some theoretical premises about the experimentation of the public space through hearing, being aware of the sound as a component that allows an appropriation and significance of the space as well as an element of social cohesion and generator of identities are analyzed.

listening sound city public space escucha sonido ciudad espacio público HUMANIDADES Y CIENCIAS DE LA CONDUCTA HUMANIDADES Y CIENCIAS DE LA CONDUCTA

Implementación de la metodología Lean Sigma en un proceso de ensamble de engranes y cadenas: Caso de estudio

Omar Celis Juan Alfonso Toscano Moctezuma (2022, [Artículo, Artículo])

RESUMEN

La metodología orientada a solución de problemas propuesta en este artículo de investigación tiene como objetivo actuar a la velocidad de Lean brindando resultados en al menos cuatro semanas. Las cinco fases de esta metodología son: identificar y medir el problema; encontrar las posibles causas que están generándolo; desarrollar una solución empleando herramientas de Lean o de Seis Sigma; una vez implementada la solución, verificarla con una corrida de comprobación y, finalmente, desarrollar un plan de control para asegurar que el estado alcanzado se mantenga en el mediano y largo plazos. Para comprobar la efectividad de la metodología Lean Sigma, se presenta un caso de aplicación en un proceso que no cumple con los requerimientos de entrega a tiempo. Por medio de herramientas Lean, como rebalanceo de la línea, takt time y just in time, se logró incrementar el porcentaje de entregas a tiempo de un 66 % a un 100 % y, a su vez, la productividad aumentó de 1.8 a 2.5 piezas/min*hombre y el lead time disminuyó de 26.07 a 17 segundos, equivalente a una mejora del 35 %. El problema fue resuelto en 24 días y la capacidad del proceso fue de un 2.6 a 3.4 sigma.

Lean Sigma Takt Time Lean Seis Sigma Solución de Problemas CIENCIAS SOCIALES; INGENIERÍA Y TECNOLOGÍA CIENCIAS SOCIALES INGENIERÍA Y TECNOLOGÍA

SOCIO-SPATIAL TRENDS: A GENERAL READING OF PUBLIC SPACE IN HOUSING DEVELOPMENTS

Mariel Organista Camacho Karen Estrella Martínez-Torres Claudia Rivera-Torres (2023, [Artículo, Artículo])

Human nature implies social interaction in diverse environments, where public space, seen as an essential mediator, becomes disconnected, impersonal, and deteriorated exterior spaces, coupled with a lack of interest in participation, inclusion, and personal development. Therefore, this research aimed to analyze the socio-spatial relationships in public spaces based on the inhabitant perception of two housing developments in Ensenada, Baja California, Mexico. This study used a mixed methodological approach to collect information by applying the following instruments: a questionnaire on public spaces, a series of in situ and aerial photographs, and field observations. A total of 196 surveys were applied from 2016 to 2019; the morphological, typological, and functional characteristics of the public space were also observed. The results evidenced an imminent need to carry out their daily activities on a smaller scale and intensity within the housing complex with a level of spatial satisfaction within a scale of 6.37/10. In this regard, the inhabitants reported a higher attendance of the public space use in Los Encinos in contrast to Villas (62.6% and 39.3%, respectively), even though the travel times were shorter in Villas. Regarding the public space usefulness, both cases weighted spatial understanding followed by access ease to the housing complex with a Pearson correlation coefficient equal to or greater than 0.47. In this sense, spatial relations showed dispersion, disorganization, and fragmentation from the ephemeral. In contrast, social relations were considered impersonal, hurried, and of convenience, subordinated to the conditions of the environment, being that personal well-being is built from relations with the exterior and with the collective itself.

Baja California Habitability Public space Social Developments Social-espatial relation conjuntos habitacionales, habitabilidad, Baja California, espacio público, relaciones socioespaciales. HUMANIDADES Y CIENCIAS DE LA CONDUCTA HUMANIDADES Y CIENCIAS DE LA CONDUCTA